Omitting comments can make the output much smaller. Size/time impact on
my machine:
- lib/Target/AArch64/AArch64GenDAGISel.inc, 10MiB (8.89s) -> 5MiB (3.20s)
- lib/Target/X86/X86GenDAGISel.inc, 20MiB (6.48s) -> 8.5MiB (4.18s)
In total, this change decreases lib/Target/*/*GenDAGISel.inc from
71.4MiB to 30.1MiB.